GRAPE INSECTS 73 



2 gallons molasses ; rains will wash this mixture off 

 and it must be repeated to be eft'ective. 



The grape-vine flea-beetle ^ (Haltica chalybea) 

 Order — ^Coleoptera 



Another American pest of grapes that in many 

 years is very serious; the first pest, usually, to ap- 

 pear in the spring on grapes; widely distributed 

 over the eastern United States. 



The adult steel-blue beetles appear early and at- 

 tack the swelling buds which they may completely 

 destroy ; when leaves appear they feed on them ; the 

 beetles lay their eggs all through May under the 

 bark on the canes, under the scales surrounding the 

 buds and occasionally on the leaves; eggs hatch 

 latter part of June or early July; the larvse then 

 feed on foliage and attain their growth in about 

 three weeks; they then drop to the ground and 

 burrow dowaiward several inches where they form 

 cells and change to pupae; the pupal stage lasts 10 

 days to two weeks; the beetles emerge and feed 

 upon the foliage but do little damage; they finally 

 enter hibernation along hedgerows, borders of 

 woods, etc., where they pass the winter. 



Control — Collect adults in pans with a shallow 

 layer of kerosene in bottom; it is as economical as 

 spraying vines ; if no rains, spray vines, w^hen bee- 

 tles begin to appear, with arsenate of lead, 6 pounds 

 water, 100 gallons and molasses, 2 gallons; later 

 spray vines with arsenate of lead 3 pounds in 50 

 gallons of water or Bordeaux mixture. 



The rose-chafer ^ (Macrodacfylns subspinosus) 

 Order — Coleoptera 



This is an American insect and is injurious to 



3 Slingerland — Cornell Univ. Expt. Stat., Bull. 157. 

 Hartzell— N. Y. State Expt. Stat., Bulls. 331, 453- 

 4Hartzell— N. Y. State Expt. Stat, Bull. 331. 



